2 Search Results for "Akgün, Özgür"

Document
DOI: 10.4230/LIPIcs.CP.2022.18
A Framework for Generating Informative Benchmark Instances

Authors: Nguyen Dang, Özgür Akgün, Joan Espasa, Ian Miguel, and Peter Nightingale

Published in: LIPIcs, Volume 235, 28th International Conference on Principles and Practice of Constraint Programming (CP 2022)

Abstract
Benchmarking is an important tool for assessing the relative performance of alternative solving approaches. However, the utility of benchmarking is limited by the quantity and quality of the available problem instances. Modern constraint programming languages typically allow the specification of a class-level model that is parameterised over instance data. This separation presents an opportunity for automated approaches to generate instance data that define instances that are graded (solvable at a certain difficulty level for a solver) or can discriminate between two solving approaches. In this paper, we introduce a framework that combines these two properties to generate a large number of benchmark instances, purposely generated for effective and informative benchmarking. We use five problems that were used in the MiniZinc competition to demonstrate the usage of our framework. In addition to producing a ranking among solvers, our framework gives a broader understanding of the behaviour of each solver for the whole instance space; for example by finding subsets of instances where the solver performance significantly varies from its average performance.
Cite as

Nguyen Dang, Özgür Akgün, Joan Espasa, Ian Miguel, and Peter Nightingale. A Framework for Generating Informative Benchmark Instances. In 28th International Conference on Principles and Practice of Constraint Programming (CP 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 235, pp. 18:1-18:18, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)

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@InProceedings{dang_et_al:LIPIcs.CP.2022.18,
  author =	{Dang, Nguyen and Akg\"{u}n, \"{O}zg\"{u}r and Espasa, Joan and Miguel, Ian and Nightingale, Peter},
  title =	{{A Framework for Generating Informative Benchmark Instances}},
  booktitle =	{28th International Conference on Principles and Practice of Constraint Programming (CP 2022)},
  pages =	{18:1--18:18},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-240-2},
  ISSN =	{1868-8969},
  year =	{2022},
  volume =	{235},
  editor =	{Solnon, Christine},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CP.2022.18},
  URN =		{urn:nbn:de:0030-drops-166479},
  doi =		{10.4230/LIPIcs.CP.2022.18},
  annote =	{Keywords: Instance generation, Benchmarking, Constraint Programming}
}
Document
DOI: 10.4230/LIPIcs.CP.2022.28
Understanding How People Approach Constraint Modelling and Solving

Authors: Ruth Hoffmann, Xu Zhu, Özgür Akgün, and Miguel A. Nacenta

Published in: LIPIcs, Volume 235, 28th International Conference on Principles and Practice of Constraint Programming (CP 2022)

Abstract
Research in constraint programming typically focuses on problem solving efficiency. However, the way users conceptualise problems and communicate with constraint programming tools is often sidelined. How humans think about constraint problems can be important for the development of efficient tools that are useful to a broader audience. For example, a system incorporating knowledge on how people think about constraint problems can provide explanations to users and improve the communication between the human and the solver. We present an initial step towards a better understanding of the human side of the constraint solving process. To our knowledge, this is the first human-centred study addressing how people approach constraint modelling and solving. We observed three sets of ten users each (constraint programmers, computer scientists and non-computer scientists) and analysed how they find solutions for well-known constraint problems. We found regularities offering clues about how to design systems that are more intelligible to humans.
Cite as

Ruth Hoffmann, Xu Zhu, Özgür Akgün, and Miguel A. Nacenta. Understanding How People Approach Constraint Modelling and Solving. In 28th International Conference on Principles and Practice of Constraint Programming (CP 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 235, pp. 28:1-28:18, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)

Copy BibTex To Clipboard

@InProceedings{hoffmann_et_al:LIPIcs.CP.2022.28,
  author =	{Hoffmann, Ruth and Zhu, Xu and Akg\"{u}n, \"{O}zg\"{u}r and Nacenta, Miguel A.},
  title =	{{Understanding How People Approach Constraint Modelling and Solving}},
  booktitle =	{28th International Conference on Principles and Practice of Constraint Programming (CP 2022)},
  pages =	{28:1--28:18},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-240-2},
  ISSN =	{1868-8969},
  year =	{2022},
  volume =	{235},
  editor =	{Solnon, Christine},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CP.2022.28},
  URN =		{urn:nbn:de:0030-drops-166574},
  doi =		{10.4230/LIPIcs.CP.2022.28},
  annote =	{Keywords: Constraint Modelling, HCI, User Study, Grounded Theory}
}
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